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Effect of Photoperiod and Temperature On Rosette Habit in Safflower 1
Author(s) -
Zimmerman L. H.
Publication year - 1973
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci1973.0011183x001300010024x
Subject(s) - photoperiodism , rosette (schizont appearance) , carthamus , habit , biology , horticulture , sowing , botany , zoology , medicine , traditional medicine , psychology , immunology , psychotherapist
The effect of photoperiod and temperature on duration of rosette habit in safflower was evaluated. Carthamus tinctorius L . and Carthamus flavescens Spreng were grown in the greenhouse at bimonthly planting dates and in controlled environment chambers at different photoperiods and temperatures. In the greenhouse, duration of rosette habit generally increased with decrease in temperature and photoperiod except for the December plantrag. Under high temperature (20/10 C with 10 hr in the light period at 20 C and 14 hr at 10 C regardless of the photoperiod) in controlled environment rooms, rosette habit of both species persisted longer in short photoperiod (10 hr) than in long (14 hr); response proportionately greater in C. tinctorius than in C. flavescens ‐ 68% and 11% longer duration of rosette habits, respectively. These species also responded differently to temperature. In low temperature (15/5 C) and long photoperiod (14 hr), duration of rosette habit of C. tinctorius was 13% longer than under high temperature (20/10 C) and short photoperiod (10 hr), while rosette habits were similar for these treatments in C. flavescens . In both species, genotypes responded differently to the photoperiod‐temperature treatments.